Phi Phi island groups not only for Snorkeling and Scuba diving, but also good for birding
too, Phi Phi island group is only one place in Andaman sea to find
Frigatebird, there are easy to find near two sea stacks beyond Koh Phi Phi Leh: Koh Bida Nok and Koh Bida Nai.
Bird List of Phi Phi Island Groups